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LT1507IN8 Datasheet(PDF) 3 Page - Linear Technology |
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LT1507IN8 Datasheet(HTML) 3 Page - Linear Technology |
3 / 20 page 3 LT1507 ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS Switch Frequency VC Set to Give 50% Duty Cycle 460 500 540 kHz –25 °C ≤ TJ ≤ 125°C 440 560 kHz TJ ≤ –25°C 440 570 kHz Switch Frequency Line Regulation 4.3V ≤ VIN ≤ 15V q 0.05 0.15 %/V Frequency Shifting Threshold on FB Pin ∆f = 10kHz q 0.8 1.0 1.3 V Minimum Input Voltage (Note 2) q 4 4.3 V Minimum Boost Voltage (Note 3) ISW ≤ 1.5A q 3 3.5 V Boost Current (Note 4) VBOOST = VIN + 5V ISW = 500mA, –25°C ≤ TJ ≤ 125°C12 22 mA TJ ≤ –25°C25 mA ISW = 1.5A, –25 °C ≤ TJ ≤ 125°C25 35 mA TJ ≤ –25°C40 mA Input Supply Current (Note 5) q 3.8 5.4 mA Shutdown Supply Current VSHDN = 0V, VIN ≤ 12V 15 50 µA VSW = 0V, VC Open q 75 µA Lockout Threshold VC Open q 2.3 2.38 2.46 V Shutdown Threshold VC Open Device Shutting Down q 0.15 0.37 0.70 V Device Starting Up q 0.25 0.45 0.70 V Minimum Synchronizing Amplitude q 1.5 2.2 V Synchronizing Frequency Range (Note 7) 580 1000 kHz The q denotes specifications which apply over the operating temperature range. Note 1: Gain is measured with a VC swing equal to 200mV above the low clamp level to 200mV below the upper clamp level. Note 2: Minimum input voltage is not measured directly, but is guaranteed by other tests. It is defined as the voltage where internal bias lines are still regulated, so that the reference voltage and oscillator frequency remain constant. Actual minimum input voltage to maintain a regulated output will depend on output voltage and load current. See Applications Information. Note 3: This is the minimum voltage across the boost capacitor needed to guarantee full saturation of the internal power switch. Note 4: Boost current is the current flowing into the BOOST pin with the pin held 5V above input voltage. It flows only during switch ON time. Note 5: Input supply current is the bias current drawn by the VIN pin when the SHDN pin is held at 1V (switching disabled). Note 6: Switch ON resistance is calculated by dividing VIN to VSW voltage by the forced current (1.5A). See Typical Performance Characteristics for the graph of switch voltage at other currents. Note 7: For synchronizing frequency above 700kHz, with duty cycles above 50%, external slope compensation may be needed. See Applications Information. Note 8: Transconductance and voltage gain refer to the internal amplifier exclusive of the voltage divider. To calculate gain and transconductance refer to SENSE pin on fixed voltage parts. Divide values shown by the ratio VOUT/2.42. TJ = 25°C, VIN = 5V, VC = 1.5V, boost open, switch open unless otherwise specified. VC Pin Shutdown Threshold JUNCTION TEMPERATURE ( °C) –50 2.44 2.43 2.42 2.41 2.40 100 LT1507 • TPC03 –25 0 25 50 75 125 2.0 1.5 1.0 0.5 0 VOLTAGE CURRENT LOAD CURRENT (A) 0 100 90 80 70 60 50 1.00 LT1507 • TA02 0.25 0.50 0.75 1.25 VIN = 5V VOUT = 3.3V Switch Peak Current Limit Feedback Pin Voltage and Current JUNCTION TEMPERATURE ( °C) –50 1.4 1.2 1.0 0.8 0.6 0.4 100 LT1507 • TPC01 –25 0 25 50 75 125 TYPICAL PERFORMANCE CHARACTERISTICS |
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